package com.gaeetan.msieideas.client;

import java.util.ArrayList;
import java.util.Date;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.event.dom.client.KeyPressEvent;
import com.google.gwt.event.dom.client.KeyPressHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.i18n.client.NumberFormat;
import com.google.gwt.user.client.Random;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;

public class Msieideas implements EntryPoint {

	private static final int REFRESH_INTERVAL = 5000;
	
	private VerticalPanel mainPanel = new VerticalPanel();
	private FlexTable stocksFlexTable = new FlexTable();
	private HorizontalPanel addPanel = new HorizontalPanel();
	private TextBox newSymbolTextBox = new TextBox();
	private Button addStockButton = new Button("Add");
	private Label lastUpdatedLabel = new Label();
	
	private ArrayList<String> stocks = new ArrayList<String>();

	public void onModuleLoad() {
		
		// Create table for stock data.
	    stocksFlexTable.setText(0, 0, "Nom");
	    stocksFlexTable.setText(0, 1, "Univers");
	    stocksFlexTable.setText(0, 2, "Description");
	    stocksFlexTable.setText(0, 3, "Groupe");

	    // Assemble Add Stock panel.
	    addPanel.add(newSymbolTextBox);
	    addPanel.add(addStockButton);

	    // Assemble Main panel.
	    mainPanel.add(stocksFlexTable);
	    mainPanel.add(addPanel);
	    mainPanel.add(lastUpdatedLabel);

	    // Associate the Main panel with the HTML host page.
	    RootPanel.get("ideasList").add(mainPanel);

	    // Move cursor focus to the input box.
	    newSymbolTextBox.setFocus(true);
	    
	    // Setup timer to refresh list automatically.
	    Timer refreshTimer = new Timer() {
	      @Override
	      public void run() {
	        refreshWatchList();
	      }
	    };
	    refreshTimer.scheduleRepeating(REFRESH_INTERVAL);

	    // Listen for mouse events on the Add button.
	    addStockButton.addClickHandler(new ClickHandler() {
	      public void onClick(ClickEvent event) {
	        addStock();
	      }
	    });

	    // Listen for keyboard events in the input box.
	    newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
	      public void onKeyPress(KeyPressEvent event) {
	        if (event.getCharCode() == KeyCodes.KEY_ENTER) {
	          addStock();
	        }
	      }
	    });

	}

	private void addStock() {

		final String symbol = newSymbolTextBox.getText().toUpperCase().trim();
	    newSymbolTextBox.setFocus(true);

	    // Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
	    if (!symbol.matches("^[0-9A-Z\\.]{1,10}$")) {
	      Window.alert("'" + symbol + "' is not a valid symbol.");
	      newSymbolTextBox.selectAll();
	      return;
	    }

	    newSymbolTextBox.setText("");

	    // Don't add the stock if it's already in the table.
	    if (stocks.contains(symbol))
	      return;
	    
	    // Add the stock to the table.
	    int row = stocksFlexTable.getRowCount();
	    stocks.add(symbol);
	    stocksFlexTable.setText(row, 0, symbol);
	    
	    // Add a button to remove this stock from the table.
	    Button removeStockButton = new Button("x");
	    removeStockButton.addClickHandler(new ClickHandler() {
	      public void onClick(ClickEvent event) {
	        int removedIndex = stocks.indexOf(symbol);
	        stocks.remove(removedIndex);        stocksFlexTable.removeRow(removedIndex + 1);
	      }
	    });
	    stocksFlexTable.setWidget(row, 3, removeStockButton);

	    // Get the stock price.
	    refreshWatchList();

	}

	 private void refreshWatchList() {
		 
		  final double MAX_PRICE = 100.0; // $100.00
		    final double MAX_PRICE_CHANGE = 0.02; // +/- 2%

		    Idea[] prices = new Idea[stocks.size()];
		    for (int i = 0; i < stocks.size(); i++) {
		      double price = Random.nextDouble() * MAX_PRICE;
		      double change = price * MAX_PRICE_CHANGE
		          * (Random.nextDouble() * 2.0 - 1.0);

		      prices[i] = new Idea(stocks.get(i), price, change);
		    }

		    updateTable(prices);

	 }

	 @SuppressWarnings("deprecation")
	private void updateTable(Idea[] prices) {

		 for (int i = 0; i < prices.length; i++) {
		        updateTable(prices[i]);
		      }

	    // Display timestamp showing last refresh.
	    lastUpdatedLabel.setText("Last update : "
	        + DateTimeFormat.getMediumDateTimeFormat().format(new Date()));

	 }

	 private void updateTable(Idea price) {
		 
	    // Make sure the stock is still in the stock table.
	    if (!stocks.contains(price.getSymbol())) {
	      return;
	    }

	    int row = stocks.indexOf(price.getSymbol()) + 1;

	    // Format the data in the Price and Change fields.
	    String priceText = NumberFormat.getFormat("#,##0.00").format(
	        price.getPrice());
	    NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
	    String changeText = changeFormat.format(price.getChange());
	    String changePercentText = changeFormat.format(price.getChangePercent());

	    // Populate the Price and Change fields with new data.
	    stocksFlexTable.setText(row, 1, priceText);
	    stocksFlexTable.setText(row, 2, changeText + " (" + changePercentText
	        + "%)");
	  }	 
	 
}
